Mercury Mariner Repair and Maintenance

A guide to problems, costs, maintenance and repair for your Mercury Mariner

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Mercury Mariner Problems

A/C Fan Speed Changing Constantly

The Mercury Mariner equipped with automatic temperature control may have a problem with frequent fan speed changes when using the heater or air conditioner. Normally, the fan speed changes only to maintain a selected temperature, but when the fan speed changes frequently and needlessly, there is an issue with the fan speed control unit. 

The fan speed control unit, sometimes erroneously called the blower motor resister, regulates the speed for the blower motor in order to maintain the temperature set by the driver. When it fails, the fan will run at random settings, and the climate control will be inaccurate.

Note: this does not affect the temperature of the air that comes from the vents, it affects the amount of air that comes from the vents. 

The repair is simple, and quick. The control unit is located behind the glove box in most models, and removal and installation takes only minutes.

Also note: this only applies to vehicles with single or dual automatic climate control.

Blower Motor Only Works on High

The 2008-2011 Mercury Mariner with manual temperature and fan controls may have problems with the the blower motor only blowing air on certain settings. Most commonly the fan will only run on the highest setting. This is a well documented problem, and is caused by a failing blower motor resistor.

Correcting the problem is straight forward, and requires replacement of the small resistor. The resistor is normally found behind the glove box, next to the blower motor.

Check Engine Light Illumination

The check engine light may come on due to failure of the Variable Camshaft Timing (VCT) solenoids. The VCT solenoids will need to be replaced if they are the reason the check engine light came on.

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Mercury Mariner Questions

Had throttle position sensor changed but still hard to steer,what can I do next? (1 answer)

Transmission slips in in 2nd and 4th gear

i keep getting a message that my passanger door is adjar but its locked and shut (2 answers)

i recently had my transmission rebuilt and when i got it back from the shop it was beeing and saying passanger door adjar. Even when its parked the alarm goes off randolmly

Car will not start without torqueing the key or trying several times to start. (2 answers)

Changed the ignition switch on the left of the steering column feel it is the key mechanism itself or the keys. Problem occurs most of the time. Have been able to start but problem is getting worse.

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Mercury Mariner Recalls

Fuel Delivery Module Leaks Fuel

The fuel delivery module (FDM) may crack and leak fuel. Dealers will replace the FDM flange with one that has a redesigned fuel supply port free of charge to resolve the concern.

Shift Lever Disengages From Transmission

For a vehicle that has had a remanufactured Ford automatic transmission installed, the shift lever bolt may be loose, allowing disengagement of the shift lever from the transmission. Dealers will inspect the transmission and either tighten the shift lever bolt or replace the shift lever assembly free of charge to resolve the concern.

Hybrid System May Overheat And Cause Stalling

The coolant pump for the hybrid system may fail, resulting in the hybrid system shutting down, and the vehicle losing power. Dealers will inspect and replace the original motor electronics coolant pump free of charge to correct the concern.

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Mercury Mariner Reviews

I bought my Mariner in 2011 with 83k miles its a good vehicle with best quality ever. My last car was a 1995 Toyota Camry that I've purchased new but sadly totaled my vehicle an very reliable car ever too but needed another dependable ride. Overall love my Mariner its nice runs and drives like a champ, there no issues with nothing good car has good handling with the V6 and the performance is be...
Had the mariner for 7 months now and I am really pleased with it. The V6 has plenty of pep for me and I really like the 30+ miles per gallon. I like the visibility and the head room. Tried a chevy equanaux and could not get in without bumping my head. I had a 03 mariner and it was about the same but not as good gas mileage. I think I will stick with mariners.
2008 Mercury Mariner - I have had my car for 6 years, over 108,000 miles and have never had a single problem with it. It still rides great. I have never had to have the breaks replaced, not even the battery. Nothing leaks and the Sewell Ford dealership in Odessa, TX has the best service of any dealership I have ever used. They are the very best.

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